#3 Bobby Lashley
Recently returning to WWE after a decade absence. Lashley spent most of the intervening years wrestling for TNA/Impact Wrestling or competing in MMA.
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Lashley most notably fought for Strikeforce and Bellator and racked up a very respectable 15-2 win record.
However, Lashley for some reason never found his way to the UFC. Would a raised profile in WWE attract UFC president Dana White to bring in Lashley for a few high profile fights? Possibly.
Despite his advancing age, Lashley possesses overwhelming power and was a National Champion in wrestling as an amateur.
Lashley versus Brock Lesnar in the Octagon would no doubt be of significant mainstream appeal.